A full cache can slow down your browser. Be sure to empty it regularly.

• Select 'General' tab.
• Under 'Browsing history' click 'Delete..'.

• In the 'Delete Browsing History' dialogue box...
• Click on 'Delete files...' from the 'Temporary Internet Files' section.
• Click on 'Delete cookies...' from the 'Cookies' section. Cookies are text files that are automatically downloaded to your hard drive by Web sites to make Web browsing easier.
• Click on 'Delete History' from the 'History' section.